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    <title>Clustered Features</title>
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          <h4 id="title">Clustered Features</h4>
          <div id="map" class="map"></div>
<form>
  <label>cluster distance</label>
  <input id="distance" type="range" min="0" max="100" step="1" value="40"/>
</form>

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          <p id="shortdesc">Example of using ol.source.Cluster.</p>
          <div id="docs"><p>This example shows how to do clustering on point features.</p>
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          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.geom.Point.html" title="API documentation for ol.geom.Point">ol.geom.Point</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.source.Cluster.html" title="API documentation for ol.source.Cluster">ol.source.Cluster</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Circle.html" title="API documentation for ol.style.Circle">ol.style.Circle</a></li>,<li><a href="../apidoc/ol.style.Fill.html" title="API documentation for ol.style.Fill">ol.style.Fill</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li>,<li><a href="../apidoc/ol.style.Text.html" title="API documentation for ol.style.Text">ol.style.Text</a></li></ul></div>
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          <textarea class="hidden" name="title">Clustered Features</textarea>
          <textarea class="hidden" name="description">Example of using ol.source.Cluster.</textarea>
          <textarea class="hidden" name="js">var distance &#x3D; document.getElementById(&#x27;distance&#x27;);

var count &#x3D; 20000;
var features &#x3D; new Array(count);
var e &#x3D; 4500000;
for (var i &#x3D; 0; i &lt; count; ++i) {
  var coordinates &#x3D; [2 * e * Math.random() - e, 2 * e * Math.random() - e];
  features[i] &#x3D; new ol.Feature(new ol.geom.Point(coordinates));
}

var source &#x3D; new ol.source.Vector({
  features: features
});

var clusterSource &#x3D; new ol.source.Cluster({
  distance: parseInt(distance.value, 10),
  source: source
});

var styleCache &#x3D; {};
var clusters &#x3D; new ol.layer.Vector({
  source: clusterSource,
  style: function(feature) {
    var size &#x3D; feature.get(&#x27;features&#x27;).length;
    var style &#x3D; styleCache[size];
    if (!style) {
      style &#x3D; new ol.style.Style({
        image: new ol.style.Circle({
          radius: 10,
          stroke: new ol.style.Stroke({
            color: &#x27;#fff&#x27;
          }),
          fill: new ol.style.Fill({
            color: &#x27;#3399CC&#x27;
          })
        }),
        text: new ol.style.Text({
          text: size.toString(),
          fill: new ol.style.Fill({
            color: &#x27;#fff&#x27;
          })
        })
      });
      styleCache[size] &#x3D; style;
    }
    return style;
  }
});

var raster &#x3D; new ol.layer.Tile({
  source: new ol.source.OSM()
});

var map &#x3D; new ol.Map({
  layers: [raster, clusters],
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

distance.addEventListener(&#x27;input&#x27;, function() {
  clusterSource.setDistance(parseInt(distance.value, 10));
});
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;form&gt;
  &lt;label&gt;cluster distance&lt;/label&gt;
  &lt;input id&#x3D;&quot;distance&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;100&quot; step&#x3D;&quot;1&quot; value&#x3D;&quot;40&quot;/&gt;
&lt;/form&gt;
</textarea>
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        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Clustered Features&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.6.5/build/ol.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;form&gt;
      &lt;label&gt;cluster distance&lt;/label&gt;
      &lt;input id&#x3D;&quot;distance&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;100&quot; step&#x3D;&quot;1&quot; value&#x3D;&quot;40&quot;/&gt;
    &lt;/form&gt;
    &lt;script&gt;
      var distance &#x3D; document.getElementById(&#x27;distance&#x27;);

      var count &#x3D; 20000;
      var features &#x3D; new Array(count);
      var e &#x3D; 4500000;
      for (var i &#x3D; 0; i &lt; count; ++i) {
        var coordinates &#x3D; [2 * e * Math.random() - e, 2 * e * Math.random() - e];
        features[i] &#x3D; new ol.Feature(new ol.geom.Point(coordinates));
      }

      var source &#x3D; new ol.source.Vector({
        features: features
      });

      var clusterSource &#x3D; new ol.source.Cluster({
        distance: parseInt(distance.value, 10),
        source: source
      });

      var styleCache &#x3D; {};
      var clusters &#x3D; new ol.layer.Vector({
        source: clusterSource,
        style: function(feature) {
          var size &#x3D; feature.get(&#x27;features&#x27;).length;
          var style &#x3D; styleCache[size];
          if (!style) {
            style &#x3D; new ol.style.Style({
              image: new ol.style.Circle({
                radius: 10,
                stroke: new ol.style.Stroke({
                  color: &#x27;#fff&#x27;
                }),
                fill: new ol.style.Fill({
                  color: &#x27;#3399CC&#x27;
                })
              }),
              text: new ol.style.Text({
                text: size.toString(),
                fill: new ol.style.Fill({
                  color: &#x27;#fff&#x27;
                })
              })
            });
            styleCache[size] &#x3D; style;
          }
          return style;
        }
      });

      var raster &#x3D; new ol.layer.Tile({
        source: new ol.source.OSM()
      });

      var map &#x3D; new ol.Map({
        layers: [raster, clusters],
        target: &#x27;map&#x27;,
        view: new ol.View({
          center: [0, 0],
          zoom: 2
        })
      });

      distance.addEventListener(&#x27;input&#x27;, function() {
        clusterSource.setDistance(parseInt(distance.value, 10));
      });
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
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